<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Vue Button Test</title>
    <script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script>
</head>

<body>
    <div id="app">
        <p>{{message}}</p>
        <button v-on:click='reverseMessage'>反转字符串</button>
    </div>
    <div id="app1">
        <span v-for="n in 20">{{ n }} </span>
    </div>
    <script>
        var vm2 = new Vue({
            el : '#app1'
        })
        var vm1 = new Vue({
            el: '#app',
            data: {
                message: 'I can be reversed!'
            },
            methods: {
                reverseMessage: function () {
                    this.message = this.message.split('').reverse().join('');
                }
            }
        })
    </script>
</body>

</html>